// Abrir pop-up do centralizado
var win = null;
function popup(pagina,nome,w,h){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings ='height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars=no,resizable=no'
	win = window.open(pagina,nome,settings)
}